Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758214AbXFKUB1 (ORCPT ); Mon, 11 Jun 2007 16:01:27 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756685AbXFKUBR (ORCPT ); Mon, 11 Jun 2007 16:01:17 -0400 Received: from srv5.dvmed.net ([207.36.208.214]:47904 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754019AbXFKUBQ (ORCPT ); Mon, 11 Jun 2007 16:01:16 -0400 Message-ID: <466DAA09.7090000@garzik.org> Date: Mon, 11 Jun 2007 16:01:13 -0400 From: Jeff Garzik User-Agent: Thunderbird 1.5.0.12 (X11/20070530) MIME-Version: 1.0 To: Kristen Carlson Accardi CC: james.bottomley@steeleye.com, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, htejun@gmail.com, arjan@linux.intel.com Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers. References: <20070611184146.448266229@intel.com> <20070611114839.907bcae2.kristen.c.accardi@intel.com> In-Reply-To: <20070611114839.907bcae2.kristen.c.accardi@intel.com> Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Score: -4.3 (----) X-Spam-Report: SpamAssassin version 3.1.8 on srv5.dvmed.net summary: Content analysis details: (-4.3 points, 5.0 required) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1386 Lines: 34 Kristen Carlson Accardi wrote: > This patch will set the correct bits to turn on Aggressive > Link Power Management (ALPM) for the ahci driver. This > will cause the controller and disk to negotiate a lower > power state for the link when there is no activity (see > the AHCI 1.x spec for details). This feature is mutually > exclusive with Hot Plug, so when ALPM is enabled, Hot Plug > is disabled. ALPM will be enabled by default, but it is > settable via the scsi host syfs interface. Possible > settings for this feature are: > > Setting Effect > ---------------------------------------------------------- > min_power ALPM is enabled, and link set to enter > lowest power state (SLUMBER) when idle > Hot plug not allowed. > > max_performance ALPM is disabled, Hot Plug is allowed > > medium_power ALPM is enabled, and link set to enter > second lowest power state (PARTIAL) when > idle. Hot plug not allowed. > > Signed-off-by: Kristen Carlson Accardi seems OK at first glance, though I'll have questions about hardware behavior once I get off this day-long Intel conference call :) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/